Since you will have to manually enter most serial numbers anyway, you might
consider creating a hardware list with a spread sheet.
Of course, you can click on START / ALL PROGRAMS / ACCESSORIES / SYSTEM
TOOLS / SYSTEM INFORMATION. This will give you extensive info for your
hardware and software, but serial numbers for every device will not be
shown.
Also, you can get a list of all of your major hardware by clicking on START
/ CONTROL PANEL / SYSTEM / HARDWARE / DEVICE MANAGER. However, again, all
serial numbers will not be listed.